Method for making coke



Patented sept, 22, 1931 UNITED STATES PATENT OFFICE CHARLES w. ANDREWS, or cnrcaeo, ILLINOIS, ASSIGNOR TO H. A. BRASSERT & com

PANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS METHOD FOR MAKING COKE No Drawing.

This case relates to a new and improved method for making coke and more particularly to a composition or mixture for use in making coke.

It is well known in the art that good coke, especially that suitable for metallurgical purposes is usually made by the addition of low volatile coals to the usual nigh volatile coal before the coking operation. Such low volatile coal usually runs from ten to twenty percent of the total mass and serves to make the coke more blocky and better adapted for usual requirements. It is also known that the grinding and mixing together of the high and low volatile coals before the coking operation has very considerably improved the structure of the coke as compared with that made without the grinding and mixing. In such usual methods, however, it has been found that the finest part of the coal dust is not desirable for coke making and hinders rather than helps in the production of satisfactory coke. i

Lar e quantities of anthracite culm are availa 1e and also of coke'breeze. These are both practically waste materials and any method of making coke which will utilize them will result in considerable savings in the cost of the coke.

It is an object of the present invention to provide a new and improved method and milirture of materials for the production of co e.

It is a further object to provide a sizing and proportionin of materials adapted for use in making co e.

It is also an object to provide a method and 'mixture adapted to utilize anthracite coke.

culm or coke breeze in the production of Other and the description proceeds.

I have found by experiment that if the fineness of the anthracite culm or dust and of coke breeze is held within. certain limits and the percentage added to the high volatile coal is also held-within certain limits I accomplish the manufacture of a coke which is equal to or better than that ohly one hundred further objects will appear as Application filed September 22, 1928." Serial No. 307,786.

an eighth inch mesh to approximately one, hundred percent passing astandard forty mesh sieve. By the statement approximatea variation of a ew percent which will not seriously affect the operation and quality of the coke. i

The remaining 85 to 95 percent consists of high volatile coal and may be crushed to the ordinary fineness used in present coke oven practice, namely, about eighty percent or more through a one eighth inch screen and approximately ninety five percent through a quarter inch screen. I have found, however, that if practically all of the high volatile 'coal is sized to pass through a one eighth inch screen the quality of the coke is materially benefited. This fine grinding of the high volatile constituent is contrary to the usually accepted practice as has been stated above, but has been found to give a better coke where the low volatile constituent of the coke comprises anthracite culm or coke breeze of the sizes and proportions I have given above.

Where reference is made to material of any specific fineness, as eighty percent or more through a one-eighth inch mesh screen, it

grade of coke is made where the hi h volatile constituent practically all passes t rough an eighth inch mesh and constitutes substanercent I intend to cover.

tially 87 to 90 percent of the whole and the anthracite dust or culm or the coke breeze is crushed to forty mesh size and constitutes from 10 to 12% percent of the total used.

tained from usual mixtures of high and My experiments have demonstrated that breeze is only crushed to pass a one sixteenth inch mesh is not quite so good but is, nevertheless, up to the standard of coke made by usual methods.

The coke made according to my invention is not only of good structure as demonstrated by the fact that a larger percentage remains on an inch screen after the usual tumbler test than remains of coke made by normal methods, but the coke itself also shows better cell structure. An important feature is the use of low volatile carbonaceous material such as anthracite culm or coke breeze which are practically waste materials which thereby reduce the cost of the coke.

WVhile I have described in detail certain ,preferred sizes and proportions of material ,by way of example, it is to be understood 1 that I contemplate such changes and modificat-ions as come within the spirit and scope of the appended claims.

I claim 1. The method of making'coke which comprises mixing a mixture comprising up to fifteen percent of low volatile solid combustible carbonaceous material sized to substantially all pass a sixteenth inch mesh screen and high volatile coal crushed to a size such that at least approximately ninety percent will pass a quarter inch mesh screen, and subecting the mixture to a coking operation. 2. The metl pd of making coke which comprises mixing approximately ten percent of low volatile solid combustible carbonaceous material sized to approximately all pass a forty mesh screen and approximately ninety percent of high volatile coal crushed to approximately all pass through aneighth inch mesh screen, and subjecting the mixture to a coking operation.

3. A coking mixture comprising seven and a half to fifteen percent of low volatile solid combustible carbonaceous material sized to substantially all pass a sixteenth inch mesh tseasa mately ten percent of coke breeze crushed to practically allpass a forty mesh screen and approximately ninety percent of high vola-.

tile coal crushed to a size to practically all pass an eighth inch mesh screen.

5. The method of making coke of selected porosity which comprises mixing high volatile coal crushed to a size such that approximately ninety percent will pass a quarter inch mesh screen, together with low volatile solid combustible carbonaceous material making up from five to fifteen percent of the entire mixture, said low volatile material being crushed to approximately all pass a sixteenth inch mesh screen, and selectively crushing said low volatile material, before said mixing, a

between said sixteenth inch size as an upper limit, and a lower limit of a size such that substantially all will pass a forty mesh screen, depending upon whether a more or less porous product is desired, the coarser sizes giving more porosity and, the finer sizes giving less porosity, and subjecting the mixture to a coking operation. Signed at Chicago, Illinois, this 19th day of September, 1928.

CHARLES W. ANDREWS. i

and eighty-five to ninety-two and a half percent of high volatile coal crushed to a size such that at least approximately eiglity'percent will pass an eighth inch mesh screen and approximately ninety-five percent will pass a quarter inch mesh. screen.

4. A coking mixture comprising approxiiao 

